Halleck came into being in 1869 when the Central Pacific Railroad was completed through the future townsite that immediately became the shipping point for supplies destined for Fort Halleck. During 1869, the town had erected two hotels and one saloon. The saloon catered to soldiers stationed at Fort Halleck. A store and a school were opened in 1874. The school remained open until the 1950s. By 1875, the population had gown to fifty and by 1900 had risen to 126.

At the time Halleck had twenty-six buildings and numerous businesses flourished. However, with the abandonment of Fort Halleck in 1886, the town had to rely on ranching and ranchers to survive. But the town was slowly dying as small ranches were bought by larger properties and combined into corporate operations. The Halleck post office continues to operate from one of the two remaining buildings in town as it serves the many local ranches.